Teun de Kruif (born 3 September 1993), known professionally as Tantu Beats, is a Dutch record producer and DJ. He is mainly known for his work with Joost Klein. In addition to his work with other arti
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9a2b7059055ebed7a8fb7623259bac1b9e6d2f68ccf4fe1190794fbddfe924. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b58274b6-4c7e-4d6e-8b95-44d61dd1fa48.json and https://artists.proofprofile.net/proofs/artist/b58274b6-4c7e-4d6e-8b95-44d61dd1fa48.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e50405d4c0ed134c2eee5e458e4887199b91fdcee8219c53e7609263b69b73. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y2010389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9596f97f54c9a59254949a84daca1c9515237e9026e7ce4486523dd4d3b410d4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd192c94d1b4032e0cf2a294ce20572f192e98847db60a99977900ccd211eb96a. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y2010349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3db3753dc116157f45e8ae5414c049de78d381d99e06f7f51a60190e37d159. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y2010343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63586fc97c0f2ac4c178c1aa6b8f3f2776135e6fe551121d5d4de71ce350045b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0de138975d204f690fb3884e02da64d003c47211676471e8d567f5164f47f0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f289193df02cdc0850a188782260a258b4e48da116db2e348a0f06056b490ca. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410133.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdb2f3fcdc7f480224e296beb547f4d3ccc0044f553b13ce5c51b5a20e8e834. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149c7c21f2b8f98c8e4cd81277aaea8e234b7d22f4d411cc3f816df5779daf65. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y2010371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9eeb952df926a3ce8965236308537707bdaf4ab0bef986d8e1d59d93dfd781. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b3cdeb57dd831d0387f89cd3d2c953ebf98fb6e2cc2880a846bdb70967eb5e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1910336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a1090d9181112d12c09a49ba8a9b66a8f2b1e948c1c38792b8fc7e1519f183. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1410278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87f3da5afad6209f1c18757b2e7ad0b770a7866bce09d4faf911a5ec1ca9a7d. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1910300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce83a9329b464dc8120d75fcec7747b044bffffb9d3f0472a590613666da36dc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d32e383b36bcff7e7ab1e926125dac90a0cb086a716fb3230e7712882efe683. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0b5db17ad070a5563f87931c53cd2cd923aae67231bafe6939353547adef26. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2e0e0b7ed7e16a9115cd4cafc52caa82ea7eeb3c3f9f41d240846c6d362e88. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12a719364e7c70efa91ec9f9bceca72217014911b286376ee4eddd1495084ab. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cf948ae01a750e601e48cb24f1aca58adb91ce72bd780d0ea07d42df1f173e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y1400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c2957e8d5ca1589768faa8f07d2a8135dc763df1d0f2fff5dc90f23204be11. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLD8Y2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9609df6aa6ff56211ccb05e91607e59a22eec4080cb2a38694e952fba5e41dc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL1MC2100008.